Attack on Titan: No Titan? Then Let's Travel Through the Apocalypse!

In the ten years following the final battle, Levi lived a peaceful life. Just as he had adapted to this peaceful era without Titans, he inexplicably found himself in another world. To Levi's delight, this world was filled with countless familiar faces, but to his dismay, it seemed far from the tranquility it appeared… "If battle is inevitable, this time, I will not lose those around me again." Note: 1. No explicit pairings; character relationships follow the original story; Levi is the central character; everyone survives. 2. Essentially a new world, an apocalypse; those who cannot accept this should avoid it. 3. Happy ending! Even with twists and turns, it will definitely be a happy ending! I created this new world so they could live happily ever after!